I have an appointment to speak with the realtor this afternoon and am wondering what are some important questions to ask and things to look out for??

If a pipe bursts in the middle of the night, you want them to call the company YOU have already vetted, and not some random contractor off the Internet. 

The other 10% are mostly communication issues so I highly recommend a signing appointment to review the entire lease with tenants before they move in so that there are no "I didn't know that" conversation later on.

If you had it for sale but NOT listed on the MLS, then there is typically not a way of knowing it was up for sale recently (unless its blasted all over the internet by the seller).

Supposedly one sibling is rogue living off radar in the cabin in the woods with no internet....  

You can research aggressive breeds on the internet fairly quickly if you don't already have a list. 

I plan on utilizing this strategy on my rentals however I may be biased as I own a sales company that generates leads and appointments for solar companies.  

She told me she would just call a contractor and ask him or her to come out on every appointment with her, for free, just to give an estimate.

Then we make an appointment to see the property. 

That might have been true decades ago, but the reality of your chosen path is that everything you need to be successful in REI exists on the internet.